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(No Model.)

2 Sheets-Sheet 1.

0. J. HOLDEN & L; GRISWOLD. TENSION DEVICE FOR SEWING MAGHINES.

N0 272,051. Patented Feb. 13,1883.

' 2 sheets- 81188: 2. 0; J. HOLDEN & L, GRISWOLD. TENSION DEVICEPORYSEWING MACHINES. N g. 272.051.

Patented Peb. 13, 1883. m

(No Model.)

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UNITED STATES PATENT ow-I E.

OREL J. HOLDEN, 0F TARRYTOWN, AND LEV GRISWOLD, OF NEW YORK, N. Y.,ASSIGNORS, BY MESNE ASSIGNMENTS, TO SAID HOLDEN AND ALBERT H. JOOELYN,OF NEW YORK, N. Y;

TENSION DEVICE- FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 272,051, dated February13, 1883.

' Application filed Septeniher28,1882. (No model.)

To all whom it may concern:

Be it known that we, ()REL J. HOLDEN, of Tarrytown, in the State of NewYork, and LEV GRISWOLD, ot' the city of New York, county and State ofNew York, are the jointinventors ofan Improvement in Tension Devices forSewing-Machines, of which the following is a specification.

Our improvements consist in tension devices,

whereby, when desired, the tension of the thread is regulated andadjusted to the feeding device, and to the number of stitches requiredto the inch, by the movement of a crank or arm which regulates theentire tension.

The following is a specification, reference being had to the drawingsaccompanying the same, in which-- Figure 1 is a front view of asewing-machine with our improvements, the cap or cover 0 being removed.Fig. 2 is a sectional view, showing the construction of the tensiondevice.

Fig. 3 isa cross-sectional view of Fig. 2 on line as w. Fig.4 is a viewatone end, showing the needle, needle-bar, foot-bar, and feed-regulator,not'described herein. Fig. 5 isa side view of a section of tension-rodand nut or arm operating and holding the same. Fig. 6 is a top view,showing arm or nut holding the tensiou-rod and the arm operating thesaid nut or arm. Fig. 7 is a side view of the arm by which thetension-rod and devices are regulated; and Fig. 8 is a front or faceview of same, as shown in Fig. 7; and Fig. 9 is aplan view ofshield andguide for the take-up and thread.

Ais the frame or body on which the devices herein described are mounted.

Bis the driving-wheel, which is the same usually found insewing-machines.

O is a cap or covering, which covers the 0 crank or bar and arm,hereinafter described.

' D is the driving-shaft, receiving its motion from the driving-wheel.

E is a rod, one endof which holds a wheel,E, having a finger-piece, e,whereby the tension 5 is adjusted, and which also adjusts the feeding-regulator G, which is attached to the other end of the said rod E. Themain shaft D works in and through a sleeve, 01, which is shown inFig. 1. Y

F is the connecting'rod, usually found in sewing-machines, forcommunicating motion sion is to be changed.

to the needle-arm H, which arm has the usual arm found in sewingmachines, and both worked in like manner, as in other machines.

To one side from the center of the finger- 5 wheelis attached, by meansof the screw h, the arm I, the other end of said arm I being attached tothe arm J by means of the screw 0', whereby said arm is moved up anddown. The other end of arm J is held fast to the rocking arm H byscrewj, and works on said screw as a pivotal point as it moves thetension bar or rod K up and down. The tension-rod Kis fixed, by means ofmale and female screws, into the arm L, which arm is fastened fixedly tothe center, or thereabout, of arm J by means of screw 7:, so that everymotion of the arm J imparts a motion to the rod K, and raises or 1owersit through the thimble or sleeve M.

On the lower end of the rod K is fastened 0 a nut, m, for the purpose ofmore securely fastening the rod K into the arm L.

In the sleeve M is the spiral spring N, held therein by the cap 0, whichsets over the spring N and has less longitude than the sides of thesleeve, so that at the greatest depression of the rod K the ends of cap0 never touch the bottom of the sleeve M. Through a hole in this cap therod K passes up through and above the sleeve M, and has adjusted on itsend, or near its end, the glass disks 1? P. I Between thesedisks thethread passes. Above these disks, and where the rod K is thrown up ,toits greatest height, is fixed thethimble-cap R, which is screwedonto theend or otherwise 83 fastened to the upper end of rod K. It is moredesirable to have it thus secured, that it may be removed.

Rightbelow the screwnut m is a loose sleeve, which rests on the arm L,into which screws the rod K. It may be dispensed with, and is onlyattached to prevent the screw m from coming in contact with arm J at apoint where the arm is attached and works on the screw j.

T is a rod securely fastened to wheel E by link or otherwise, and passesup behind the cover 0, parallel with arm I, and serves as an indicatorbya required movement for regulating and adjusting the wheel E when theten- Other devices suitable thereto may be employed.

On the end view we indicate the take-up by Fig. 1, which is fastened atits top to piece 2. The other end is free, and by its loop 3 holds thethread in its passage down into the'needle. On the take-up is theprojection 4, which occurs between the two curves formed on the face ofthe same on the side facing the needle. On the needle-bar is placed thepin 5, on which,

is secured theloose pulley 6, so that this takeup always rests againstthe pulley, and is pushed back from the needle as the needle-bar goes upand down, and yet the thread pulls it forward toward the needle-bar whenthe hook takes up the slack thread and the pulley 6 has passed eitherside of point 4.

We have shown in Fig. 4 other parts of a sewing machine, which embracenew devices, for

which we intend to file applications for Letters Patent. The sameconsists of a rotary hook,

w hich is fastened to and receives its motion from inch.

1n operating the tension device the thread passes from the spool throughthe loop in support at W on the frame of the machine. The thread thenpasses between the disk P and P, and from thence passes down through thethread-guide W on the needle-bar, through the take-up in loopS, to theneedle. as the needle-hook (which may be of any kind usually employed)allows the thread to be loosened in' forming the stitch, which willoccur as the needle is raised up from making the last stitch, thetake-up is pushed out from the needle-bar having the loop W, and theneedle- .bar, in rising, throws the take-up out when the pulley 6strikes the point 4 and so takes up the slack thread. Now, as theneedle-bar descends, the loop W descends with it, and by thetime theneedle has entered the material to make another stitch the take-up hasapproached the needle-bar, the pulley 6 having passed the point 4, andthus slack is given for -the forming of the next stitch; but it isdesired to allow more slack thread to the takeup, and to do so changethe tension. The handle 6 is turned up and the wheel E is turned tillthe rod T byits fingerindicates on dial V the proper tension is obtainedand the stitch required is fixed. By turning up the handle 6 the arm Ihas been thrown up, thus raising the end of arm J, to which is fastenedarm I. This has likewise raised the end of the arm L where it isattached to the arm J, and has raised also the other end of the arm L,wherein is fixed the rod K, thus pushing the rod K up through the sleeveM, and thus relieving the pressure on the disks P and P As soon on thecap 0, which is pressed up by the extension of the spring N. The disksdo not now hold the thread so tenaciously, but grasp it from the spooland loosely hold it for the use of the needle. To increase the tensionthe reverse movement is made. The arm or handle e is turned down untilthe rod T indicates on the dial that the desired length of stitch isobtained. By the lowering of the arm 0 the rod I has been pulled down,and with .it the arm J, arm L; and'the rod K is pulled down through thesleeveM, compressingthe cup 0 over the spring N, which resisting thepressure-forces the disks P and P up against the thimble It. Thus thegrasp of the disks on the thread is increased, andof course the tensionis made greater. Now, the desired tension obtained, the rocking arm H,as the needle is operated, raises and lowers the rod K, and its devices,as it rocks, by raising and lowering the arm J and arm L; but the disksare held just so much the tighter or looser as the bar I has been raisedor lowered. This rocking motion of the bar H of course allows the threadto be grasped and pulled through either for along or short stitch, asdesired, and regulated. It will be seen, however, that the bar I has nomotion except as it is moved by the crank or handle 0, and does notpartake of the motion of the machine. Thus it will be seen that we havean adjustable tension which never requires alteration, and by the simplemovement of the handl'ee is stitch.

We do not claim the feeding device here, as we claim the adjustment ofthe same and other devices in applications made by us for patents forthe same, as found-in our application ,for patent for sewing-machinesfiled October 10, 1882, Serial No. 73,900.

Having thus described our invention, what we desire to secure by LettersPatent is-- 1. In a sewing-machine,the tension device composed of thewheel E, rod I, arm J, and arm L, rod K, with disks P and P, sleeve M,with the rocking arm H, substantially as shown and described.

adjusted to any 2. In a sewing-machine, the tension devices consistingof the wheel E, having handle 0,

rod I, arm J, and arm L, operated and fixed OREL J. HOLDEN. LEVGRISWOLD.

Witnesses:

B. S. CLARK, A. H. J OCELYN.

